Hello SwamiSalami,
You'll fry something. If your microwave needs 700 watts, that looks like about 60 amps to the 12 volt power point. Most are fused at 20 amps. Also the 700 watts may be the microwave output, and 1000 watts needed at the plug. That means something like a 1500 watt inverter and huge battery cables.
You'll need a different plan.
-mort
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